90 



THE MECHANISM OF LIFE 



the spinal cord there issue out spinal nerves, one pair at each 

 joint of the vertebral column. These also consist of fibres going 

 to and coming from the body, limbs, and skin. Along cither 

 side of the vertebral column are other two series of outlying nerve 

 ganglia which form the sympathetic nervous system, and these: 



CerVical 



-7 al 

 , b/exus 



(V-Vllcer\f 

 JcLorsal ) 



FIG. 21. A GENERAL DIAGRAM OF THE CENTRAL PARTS OF THE Hi MAN 

 NERVOUS SYSTEM. 



The sympathetic ganglia and their main connections with the spinal 

 nerves are represented in black 



ganglia are all connected with the spinal nerves by communi- 

 cating branches. Most people are familiar with the " solar 

 plexus." which is an important part of the sympathetic nervous 

 system. The cranial nerves go mainly to the muscles of the face.! 

 and eyes, or come from the great sense organs of the head. The 



